feat(#3): integrate Toast notifications into auth, enrollment, and reward flows

[Uchechukwu-Ekezie]

Closes #3

What changed

• connect/page.tsx: show success toast after wallet connects, error toast on failure
• courses/[courseId]/page.tsx: toast on enrollment success and on enrollment error
• courses/[courseId]/modules/[moduleId]/page.tsx: toast on module complete and on error
• courses/[courseId]/quiz/page.tsx: toast on quiz submit success and on failure
• rewards/page.tsx: wrap claim handler to show success/error toast after each claim attempt

Why

Each page calls the existing useToast() hook locally (returns { addToast, ToastContainer }), rendering <ToastContainer /> in its own JSX. This matches the hook's design — independent state per call site — and avoids adding a global context to the server-component layout.tsx.

How to test

• Connect wallet → see green "Wallet connected successfully!" toast
• Enroll in a course → see green "Successfully enrolled in the course!" toast; simulate a network error → see red "Enrollment failed" toast
• Complete a module → see "Module marked as complete!" toast
• Submit a quiz → see "Quiz submitted successfully!" toast
• Claim a reward on the Rewards page → see "Reward claimed successfully!" toast

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[DeFiVC]

Summary

Integrates toast notifications into 5 key user flows per issue #3: wallet connect, course enrollment, module completion, quiz submission, and reward claiming. Each page independently uses useToast() with its own <ToastContainer />.

What's Changed

• src/app/(auth)/connect/page.tsx: Success/error toast on wallet connect

• src/app/courses/[courseId]/page.tsx: Success/error toast on course enrollment

• src/app/courses/[courseId]/modules/[moduleId]/page.tsx: Success/error toast on module completion

• src/app/courses/[courseId]/quiz/page.tsx: Success/error toast on quiz submission

• src/app/rewards/page.tsx: Success/error toast on reward claim (wraps claim in handleClaim)

• .eslintrc.json + package.json / package-lock.json: ESLint setup (same as PR #5)

Blocking Issues

None. ✅

Minor Nits

• ⚠️ Quiz toast messages are generic success/error rather than showing the score percentage as issue #3 suggested. Consider adding result.percentage if the API supports it.
• ⚠️ Error message wording slightly differs from issue spec (cosmetic only).

What's Good

• Consistent pattern across all 5 pages — each calls useToast() and renders its own <ToastContainer />
• Clean try/catch blocks with user-friendly messages
• No scope creep — only toast-related changes
• The approach (local toast state per page) is simpler than the global ToastProvider suggested in the issue, and avoids adding complexity to the server-component layout